feat: add times to assessment date pickers

[jfdoming]

Notion ticket link

Add start / end time in test session

Implementation description

times! Add times to assessment date pickers. Classroom picker to follow.

Steps to test

1. Create a new assessment (as a teacher) and set a time.
2. Edit an assessment and view/set the time.

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[github-actions]

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[carissa-tang]

should we update these to show start time (for upcoming) and end time (for active)?

[jfdoming]

should we update these to show start time (for upcoming) and end time (for active)?

I think in the interest of small screens, since this is just the start date, I think it would be fine to truncate to the nearest day? Let me know if you see a justification for including the exact time, but IMHO if a teacher assigns multiple assessments on the same day they'll probably name them like "Counting Test," "Shapes Test," etc., so it won't be hard to differentiate.

[carissa-tang]

awesome work !! 🚀